The Humpback Chub is a bottom feeder fish that thrived in the warm waters of the Colorado River before Glen Canyon Dam was built and turned the Colorado River into a much colder river that it is today. It was declared endangered in 1967 and has one of its last strongholds in the Little Colorado River in Grand Canyon National Park. Since the Humpback Chub is protected from fishing, it has learned to recognize the bottoms of the river rafts coming down the Colorado River and gathers around them when they stop to camp near the Little Colorado River. This gives the unique and special opportunity to actually see numerous examples of this endangered fish in the wild: